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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Fair Value and Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivatives not designated as hedges | Foreign exchange contracts | Cost of services/sales |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Loss) | $ (17) | $ (10) | $ 15 | $ (3)
Fair Value Hedging | Derivatives designated as hedges | Cross currency swap | Interest expense |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Loss) | 6 | $ 19 | (6) | $ 66
Cash Flow Hedging | Derivatives designated as hedges |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Loss) | (32) |  | 28 |
Cash Flow Hedging | Derivatives designated as hedges | Cross currency swap | Interest expense |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Loss) | (30) |  | 25 |
Cash Flow Hedging | Derivatives designated as hedges | Foreign exchange contracts | Cost of services/sales |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Loss) | $ (2) |  | $ 3 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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